Adealer has a lot that can hold 30 vehicles. in this lot, there are two available models, a and b. the dealer normally sells at least twice as many model a cars as model b cars. if the dealer makes a profit of $1300 on model a cars and $1700 on model b cars, how many of each car should the dealer have in the lot given that the total profit for the sale of both cars is $43,000?